The composition here is lacking in my mind. Perhaps if you shot this from another angle, and it was not so dead center that would be better.
I would also like to have seen a shallower DOF to blur out the busy background. Color balance and exposure seem okay.
This is a little small, and would probably do a little better if it were bigger. But, as is, spot on for the challenge, the cropping is good, and the people in the background give it a very natural feel. 7